February 1st to 5th 2016
Olhão, Portugal
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Assessing the Marine Fouling Community in a Man-made Marina at Manila Bay

Oral Presentation
Biological Invasions
Thursday, February 4, 2016 -
16:30 to 16:45

Ocampo, M.A. 1 Oliva, I. 2 Tan, R. 3 Sia Su, G. 4 Vallejo Jr, B. 5 Manubag, L. 6

1Department of Biology, University of the Philippines Manila
2Department of Biology, University of the Philippines Manila
3Department of Biology, University of the Philippines Manila
4Department of Biology, University of the Philippines Manila
5Institute of Environmental Science and Meteorology, University of the Philippines Diliman
6Curatorial Department, Manila Ocean Park

Manila Bay holds the largest port in the Philippines, and hence facilitates transport of organisms from one region to another. This study aims to assess the fouling community inhabiting a man-made marina in Manila Bay. It provides baseline information on what constitutes the current fouling community thriving in the waters of Manila Bay. The study represents a one-off assessment of fauna at five areas in close proximity at the South Harbor of Manila Bay using artificial collectors. Fouler collectors were deployed in 5 sampling points for 60 days, between November and December 2013 (wet season). Fouler collector design was adapted from the North Pacific Marine Sciences Organization (PICES). Collected fouling organisms were identified using taxonomic keys. Species diversity (H) through Shannon Wiener Index and the Species Evenness (H/Hmax) were determined. A total of 9725 fouling organisms were obtained in all the sampling points. Of this total, the fouling organisms obtained belong to 13 families. The total abundance of the fouling communities did not show significant differences (F=0.198; P=0.939) at the different sampling points. A relatively consistent diversity index was also observed (H = 1.02 to 1.42; H/Hmax = 0.44 to 0.55). The most common fouling organism was Balanus amphitrite. Other abundant organisms include anthozoans, bryozoans, and polychaetes which were similar to other studies around the globe. The presence of polychaete species Capitella capitata and Polydora sp. in the study area may indicate that the environment is under stress due to pollution. Two species that were observed in the man-made marina are known to be invasive species; Mytilopsis sallei and Brachidontes sp., although their abundance does not show them to be invasive. It is important to monitor these species particularly Mytilopsis sallei as the species has been detected in high densities in Singapore, Hongkong, Thailand, India, Taiwan, Malaysia and Australia. Its presence has caused ecological and economic damages to these locations. This study generates a list of fouling organisms that will be useful in the future evaluation of Manila Bay. Continuous monitoring of these organisms particularly the invasive species is necessary as these organisms may bring about consequent risks and damages to Manila Bay’s aquatic ecosystems.
keywords: 
Fouling, Manila Bay, Diversity

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